If you need Messenger for a legitimate reason (e.g., contacting your parents for a ride, or coordinating a project), ask the IT admin or teacher. They might unblock it for 30 minutes just for you. It never hurts to ask.
Sometimes, the "block" isn't a technical issue—you may have accidentally blocked a friend yourself. Here is how to unblock a specific user so you can chat with them again. unblock facebook messenger
This is the most reliable method. A VPN encrypts your internet traffic and routes it through a server in a different location. To the network firewall, it looks like you are browsing generic encrypted data, not accessing Facebook. If you need Messenger for a legitimate reason (e